We’re expecting Microsoft to announce a number of upgrades to its Windows Phone OS, including potentially unveiling its next major iteration, Windows Phone 8 Apollo. Upgrade incompatibilities for older Windows Phone devices is one question that’s arisen, particularly after some major aspects of Apollo were leaked a few months back.

Although often critically acclaimed, Windows Phone devices have been slow to pick up momentum among consumers. Microsoft’s mobile OS was a late entrant to the market, which is currently dominated by iOS and Android. According to recent stats from IDC, Windows Phone could overtake Android by 2016 to become the world’s second-most popular mobile platform.

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